Java bindings for libiec61850

The purpose of this release is to add the SWIG configuration for Java to include into libiec61850 and to also create a tutorial on how to build and run the test programme test_javaiec61850.java. It is modelled on the Python pyiec61850 bindings.

Preconditions

It is easiest to test this PR in a Docker container from the project libiec61850-docker . This Docker project was created to have all the dependancies in place for building libiec61850 and all the Java items too.

Step 1.

Follow the README of the libiec61850-docker project to make sure you have a Docker container that can run all the tests.

Tests

Test 1: Test the building of the container

To test this work, follow all the instructions of the tutorial